List all tournaments or create a new tournament.

GET /api/v1/tournaments?format=api&ordering=-players_start&page=1410
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
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                "summary": "First priority : HK people join plz                                                                     \nThis group welcomes everyone, but only if you don't be rude.",
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